fix close_wait and tomcat connection keeps growing

[taobaorun]

Motivation and Context

Reproduction Scenario:

Perform stress testing at 120 TPS.
MCP client/server environment: 4 cores, 8 GB memory.
Create an MCP client, invoke methods, then close the client.
Issue:

A large number of CLOSE_WAIT connections appear on the Tomcat side. Meanwhile, the number of Tomcat connections keeps increasing. After observation, neither the CLOSE_WAIT states nor the connections are being released.

CLOSE_WAIT

tcp 1 0 127.0.0.1:8080 127.0.0.1:41480 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:37302 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:38498 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:56912 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:43558 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:59106 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:56932 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:51550 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:51164 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:43560 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:34260 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:41716 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:35992 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:44786 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:55236 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:59386 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:53424 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:56114 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:58248 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:52838 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:48726 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:36736 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:45538 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:59914 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:40062 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:52192 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:33146 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:47786 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:58276 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:49948 CLOSE_WAIT - tcp 1 0 127.0.0.1:8080 127.0.0.1:49464 CLOSE_WAIT - 

Tomcat Connection

lrwx------ 1 admin admin 64 12月 14 13:53 960 -> socket:[23255743]
lrwx------ 1 admin admin 64 12月 14 13:53 961 -> socket:[23420857]
lrwx------ 1 admin admin 64 12月 14 13:53 962 -> socket:[23662408]
lrwx------ 1 admin admin 64 12月 14 13:53 963 -> socket:[23520462]
lrwx------ 1 admin admin 64 12月 14 13:53 964 -> socket:[23220526]
lrwx------ 1 admin admin 64 12月 14 13:53 965 -> socket:[23403999]
lrwx------ 1 admin admin 64 12月 14 13:53 966 -> socket:[23260212]
lrwx------ 1 admin admin 64 12月 14 13:53 967 -> socket:[23793138]
lrwx------ 1 admin admin 64 12月 14 13:53 968 -> socket:[23713542]
lrwx------ 1 admin admin 64 12月 14 13:53 969 -> socket:[23426193]
lrwx------ 1 admin admin 64 12月 14 13:53 970 -> socket:[23570999]
lrwx------ 1 admin admin 64 12月 14 13:53 971 -> socket:[23222233]
lrwx------ 1 admin admin 64 12月 14 13:53 972 -> socket:[23387440]
lrwx------ 1 admin admin 64 12月 14 13:53 973 -> socket:[23288628]
lrwx------ 1 admin admin 64 12月 14 13:53 974 -> socket:[23293539]
lrwx------ 1 admin admin 64 12月 14 13:53 975 -> socket:[23404582]
lrwx------ 1 admin admin 64 12月 14 13:53 976 -> socket:[23366146]
lrwx------ 1 admin admin 64 12月 14 13:53 977 -> socket:[23741741]
lrwx------ 1 admin admin 64 12月 14 13:53 978 -> socket:[23598858]
lrwx------ 1 admin admin 64 12月 14 13:53 979 -> socket:[23232809]
lrwx------ 1 admin admin 64 12月 14 13:53 980 -> socket:[23401313]
lrwx------ 1 admin admin 64 12月 14 13:53 981 -> socket:[23232813]
lrwx------ 1 admin admin 64 12月 14 13:53 982 -> socket:[24086253]
lrwx------ 1 admin admin 64 12月 14 13:53 983 -> socket:[23409146]
lrwx------ 1 admin admin 64 12月 14 13:53 984 -> socket:[23426197]
lrwx------ 1 admin admin 64 12月 14 13:53 985 -> socket:[23858842]
lrwx------ 1 admin admin 64 12月 14 13:53 986 -> socket:[23385364]
lrwx------ 1 admin admin 64 12月 14 13:53 987 -> socket:[23694127]
lrwx------ 1 admin admin 64 12月 14 13:53 988 -> socket:[23692908]
lrwx------ 1 admin admin 64 12月 14 13:53 989 -> socket:[23628026]
lrwx------ 1 admin admin 64 12月 14 13:53 990 -> socket:[23313794]
lrwx------ 1 admin admin 64 12月 14 13:53 991 -> socket:[23236207]
lrwx------ 1 admin admin 64 12月 14 13:53 992 -> socket:[23790058]
lrwx------ 1 admin admin 64 12月 14 13:53 993 -> socket:[23426205]
lrwx------ 1 admin admin 64 12月 14 13:53 994 -> socket:[23700721]
lrwx------ 1 admin admin 64 12月 14 13:53 995 -> socket:[23617975]

How Has This Been Tested?

Breaking Changes

benchmark test

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

[taobaorun]

Hey @Kehrlann , mind taking a look at this PR when you get a sec? We ran into a potential stability issue during stress testing, and I’d feel way better if you could give it a quick review. Thanks!

[He-Pin]

你在哪个公司呀？